21220012203 has 16 divisors (see below), whose sum is σ = 30474635520. Its totient is φ = 13056380064.

The previous prime is 21220012201. The next prime is 21220012207. The reversal of 21220012203 is 30221002212.

It is a happy number.

It is not a de Polignac number, because 21220012203 - 2¹ = 21220012201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21220012201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 224250 + ... + 304512.

It is an arithmetic number, because the mean of its divisors is an integer number (1904664720).

Almost surely, 2^21220012203 is an apocalyptic number.

21220012203 is a deficient number, since it is larger than the sum of its proper divisors (9254623317).

21220012203 is a wasteful number, since it uses less digits than its factorization.

21220012203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87058.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21220012203 its reverse (30221002212), we get a palindrome (51441014415).

Subtracting 21220012203 from its reverse (30221002212), we obtain a palindrome (9000990009).

The spelling of 21220012203 in words is "twenty-one billion, two hundred twenty million, twelve thousand, two hundred three".